Utils.Mvc.cs

using System;
using System.IO;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace MyWebsite {
    
    public partial class Utils {

        public static class Mvc {

            public class WebFormController : Controller { }

            public static HtmlString RenderPartial(string partialName, object model) {

                // Get a wrapper for the legacy WebForm context
                HttpContextWrapper context = new HttpContextWrapper(HttpContext.Current);

                // Create a mock route that points to the empty controller
                RouteData route = new RouteData();
                route.Values.Add("controller", "WebFormController");

                // Create a controller context for the route and http context
                ControllerContext ctx = new ControllerContext(new RequestContext(context, route), new WebFormController());


                if (partialName.StartsWith("Partials/")) partialName = "~/Views/" + partialName;
                if (!partialName.EndsWith(".cshtml")) partialName += ".cshtml";

                // Find the partial view using the view engine
                ViewEngineResult result = ViewEngines.Engines.FindPartialView(ctx, partialName);
                if (result == null || result.View == null) throw new Exception("Partial view \"" + partialName + "\" not found.");

                // Render the partial view to a StringBuilder
                StringBuilder sb = new StringBuilder();
                using (StringWriter writer = new StringWriter(sb)) {

                    // Create a view context and assign the model
                    ViewContext vctx = new ViewContext(ctx, result.View, new ViewDataDictionary { Model = model }, new TempDataDictionary(), writer);

                    // Render the partial view
                    result.View.Render(vctx, writer);

                }

                return new HtmlString(sb.ToString());

            }

        }

    }

}